May, 2010 pg. 1

The Ultimate in Precision Pressure Control

Precision Back Pressure Regulators

Unique Diaphragm Regulator Technology:• 5X more Precise than standard Pressure Regulators• Dome loaded: for Manual or Automated control

• Elegant friction-less design• Suitable for ultra-pure, hygienic, and aggressive chemicals

NL Series & NLB Series Liquid, Gas and Mixed Phase Service

Gas and Pressure stability across widely varying flow rates

Pressure• range: 0.1 to 2000 psiStandard Body Materials: SS316, PVC• Diaphragms: PTFE, Viton, Buna, PE, SS316• Sizes 1/8” through 1”•

Dome Loaded DesignMatches your process pressure 1:1 to the pressure • provided on the top reference port

In Line PortingOpposed inlet and outlet ports•

Manual AdjustmentUse manual regulator to provide set-point•

Computer Automated ControlUse electronic pressure regulator to provide set-point•

1/2” EB4NL4 SS316 w/ manual set-point

3/8” EB3NL3 SS316

May, 2010 pg. 2

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The Equilibar® back pressure regulator is an exciting breakthrough in precision pressure control. Designed for critical and demanding processes, the patented Equilibar® offers unmatched precision across a wide range of pressures and flow rates.

How the Equilibar Back Pressure Regulator Works

The Equilibar® Precision Back Pressure Regulator works like a fluid transistor by forming a unique force balance on an flexible membrane between three separate pressures.

The fluid inlet pressure and the downstream exhaust pressure exist on the wetted side of the membrane, separated by a valve seat. The reference air pressure exists on the non-wetted side.

The lower pressure of the outlet tries to hold the membrane in a leak-tight seal with the valve seat. However, any slight excess between the fluid inlet pressure and the reference pressure quickly over-whelms these seating forces and pulls the mem-brane away from the valve seat.

Traditional backpressure regulators use springs to gradually open up as the overpressure is used to compress the spring.

The Equilibar® pressure regulator uses only a fric-tionless flexible membrane to modulate the pres-sure. It fully opens in less than 1 psi overpressure; less than 0.01 psi in some applications.

Equilibar back pressure technology is protected by US and foreign patents.

Unmatched Precision . . . .

3/8” EB3NL3 Teflon (PTFE)

May, 2010 pg. 3

NL & NLB Series Precision Back Pressure Regulator

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Dramatic stability improvement

The Equilibar® sets a new industry standard in pres-sure control. This chart shows the superior flow stability of the Equilibar® over the Tescom regulator.

Note: Due to the traditional spring actuated back pressure regulation the Tescom performance shows a significantly higher amount of overpressure than the Equilibar® regulators over varying flow rates. Traditional pressure regulators hold constant pres-sure until you very the flow rate.

Back Pressure Regulator vs. Pressure Reducing Regulator

Pressure Reducing Regulators (PRR’s) are the most common type of regulator. They reduce a higher up-stream pressure into a controlled, lower downstream pressure. A PRR opens to increase downstream pressure and closes to reduce it.

A Back Pressure Regulator (BPR) works in the op-posite way, controlling the upstream pressure. Just like a relief valve, a BPR closes to increase upstream pressure, and opens to reduce it. The Equilibar GS series is a precision Back Pressure Regulator that is dome-loaded. A fluid signal com-mands the regulator to control with a 1:1 ratio. This signal is supplied via a manual or electronic pres-sure device.

Precision over varying flow ranges

The inlet pressure of most back pressure regulators vary significantly with changes in process flow.

The chart at right shows how the Equilibar GS regulator holds a constant process pressure even through widely varying flow rates. The GS regulator can achieve as high as 10000:1 flow turn down ra-tios. This is extremely useful in applications where the flow consumption varies significantly. Pressure is maintained stable even with sudeen spikes or drops in flow.

PRR BPR

0

100

200

300

400

500

0 200 400 600 800

0

10

20

30

40

50

60

70

80

0 5 10 15 20 25 30In

let P

ress

ure,

kpa

g

Air Flow, normal LPM

Inle

t Pre

ssur

e, p

sig

Air Flow, SCFM

Air Performance ComparisonEQUILIBAR® vs. Tescom

Equilibar® 3/8"

Equilibar® 1/4"

Tescom 26-23 High Precision(1/4", 3/8", 1/2")

Set Point 30 psi (206 kPa)

0

5

10

15

20

25

30

35

40

45

0 50 100 150 200 250 300

0

1

2

3

4

5

6

7

0 2 4 6 8 10 12

Inle

t Pre

ssur

e, k

pag

Air Flow, normal LPM

Inle

t Pre

ssur

e, p

si g

Air Flow, SCFM

Low Pressure Air ComparisonEQUILIBAR® vs. Fairchild

EQUILIBAR® 3/8"

Fairchild 30 BP Precision 3/8"

Set Point 3 psi (85 kPa)

0.3 3 30 300

1

10

100

0.1

1

10

100

0.01 0.1 1 10 100

Air Flow, normal LPM

Inle

t Pre

ssur

e, k

pag

Inle

t Pre

ssur

e, p

sig

Air Flow, SCFM

Ultra Wide Flow Range Performance3/8" Equilibar GR w/ VT9 diaphragm

Various Set Points: .25, .5, 1, 2, 5, 10 and 30 psig

May, 2010 pg. 4

Material Pressure Range

PTFE 0.2 psig to max body pressure

PTFE/Glass 5 psig to max. body pressure

PolyEthylene 0.02 psig to 20 psig

Viton (reinforced) 0.5 psig to max body pressure

Buna N (reinforced) 0.5 to max. body pressure

SS316 100 psig to max. body pressure

NL Series Precision Back Pressure RegulatorNL Series Features

Metallic NL Series

Polymeric NL Series

3/8” EB3NL3 SS316

Model Inlet /Outlet Port

Reference Port

Standard BodyMaterials Dim A Dim B Max Std

PressureMax Custom

PressureCv Range

(precision)Available End

Fittings

(inch) (psig) Min1 Max Std Available

EB2NL2 1/4”

1/8”

SS316 (std)

Carbon Steel (Black Oxide)

3.0 1.6 500 2000 1E-3 1.0

NPT

150#Flange

BSPSAE

VCO styleVCR style

EB3NL3 3/8” 3.5 1.7 400 1500 1E-3 1.8

EB4NL4 1/2” 4.5 1.9 400 1500 1E-3 3.0

EB5NL6 3/4” 6.0 2.4 300 1000 1E-2 6.2

EB6NL8 1” 7.0 3.2 300 1000 1E-2 9.9

EB8NL12 1 1/2” 9.0 4.6 200 500 1E-1 14.3

EB10NL16 2” 11.0 5.5 200 500 3E-1 30.2

For liquid, gas & mixed phase processesRugged Bar Stock DesignUnique Chatter Suppresion FeatureHigh Precision

Model Inlet/Outlet Port

Reference Port

Standard BodyMaterials Dim A Dim B Max Pressure

psigCv Range

(precision)Available End

Fittings

(inch) PVC, other PTFE Min1 Max Std Available

EB2NL2 1/4”

1/4”

PVC (std)PTFE

CPVCPVDF Acetal

3.0 1.6 100 50 1E-3 1.0

NPT

BSP

Flange (PVC, CPVC)

EB3NL3 3/8” 3.5 1.7 100 50 1E-3 1.8

EB4NL4 1/2” 4.5 1.9 75 50 1E-3 3.0

EB5NL6 3/4” 6.0 2.4 75 50 1E-2 6.2

EB6NL8 1” 7.0 3.7 75 50 1E-2 9.9

Available Diaphragms

Wetted Components Body & Diaphragm• No wetted o-rings • Chatter Suppression Ability• 1 - Minimum Cv dependant on diaphragm • and set-point pressureDimensions and Cv values subject to change•

A

Reference Port (1/8")

B Outlet Port Inlet Port

May, 2010 pg. 5

Material Pressure Range

PTFE 0.2 psig to max body pressure

PTFE/Glass 5 psig to max. body pressure

PolyEthylene 0.02 psig to 20 psig

Viton (reinforced) 0.5 psig to max body pressure

Buna N (reinforced) 0.5 to max. body pressure

SS316 100 psig to max. body pressure

NLB Series Precision Back Pressure RegulatorNLB Series Features

Metallic NL Series

Polymeric NLB Series

1” EB6NLB8 PVC

Model Inlet /Outlet Port

Reference Port

Standard BodyMaterials Dim A Dim B Max Std

PressureMax Custom

PressureCv Range

(precision)Available End

Fittings

(inch) (psig) Min2 Max Std Available

EB6NLB8 1”

1/8”

SS316 (std)

Carbon Steel (Black Oxide)

6.8 2.1 200 500 1E-2 9.8

NPT Butt WeldFlange

EB8NLB12 1 1/2” 8.8 3.1 400 1500 1E-1 14.3

EB10NLB16 2” 10.8 4.1 400 1500 3E-1 30.2

EB16NLB24 3” 12.7 6.1 300 1000 6E-1 60.0

For liquid, gas & mixed phase processes1

Rugged Bar Stock DesignFeatures External Elbows (Welded)

Model Inlet/Outlet Port

Reference Port

Standard BodyMaterials Dim A Dim B

Max Pres-surepsig

Cv Range(precision)

Available End Fittings

(inch) PVC, other Min2 Max Std Available

EB6NLB8 1”

1/4”

PVC (std)PTFE

CPVCPVDF Acetal

7.0 3.1 75 1E-2 9.9

NPT Socket Weld

EB8NLB12 1 1/2” 9.0 4.3 75 1E-1 14.3

EB10nlb16 2” 11.0 3.0 75 1E-1 30.2

EB10NLB20 2 1/2” 13.0 3.5 75 3E-1 34

Eb16NLB24 3” 17 4.0 75 6E-1 60.0

Available Diaphragms

Wetted Components Body & Diaphragm• No wetted o-rings • Chatter Suppresion Ability• 1 - Contact factory for liquid applications• 2 - Minimum Cv dependant on diaphragm • and set-point pressure and set-point pres-sure

A

B

NPT Inlet NPT Outlet

May, 2010 pg. 6

Applications

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There are hundreds of potential applications for the unique capabilities of the Equilibar®. The NL and NLB series is specifically designed liquid, gas and mixed phase services.

Applications span from ultra low flow rates to extreme high pressures. By using unique combinations of diaphragms and o-ring materials, Equilibar® regulators are able to perform in the harshest environments that include high temperature and aggressive chemicals.

Precision Control with Closed Loop Control

For most applications, the Equilibar® is precise enough to be used with a simple manual set-point pressure input. However, for some automation appli-cations, it is useful to have closed loop control using an external pressure transmitter. By using an electro-pneumatic regulator with external feedback, it is pos-sible to match the reading of your process pressure transmitter exactly to your desired set-point.

The Equilibar® provides numerous benefits over traditional control valves in these closed-loop appli-cations. Such benefits include extremely wide flow range, ultra fast reaction times, and ease of PID tun-ing.

Equilibar PrecisionBack Pressure Regulator

®

I O

air

Process

PT

Pressure Feedback0-10 VDCor 4-20 mA

Set Point0-10 VDCor 4-20 mA

E/P

Electro-PneumaticRegulator w/External Feedback

PIDController

Liquid / Pump Pressure Control

The Equilibar® can precisely control the discharge pressure of virtually any type of pump by simply plac-ing the regulator in the return line back to the supply reservoir.

Use an ectro-pneumatic regulator for the set-point signal for computer automation of your system pres-sure. Or use a manual regulator, as shown to the left, for simple manual control of your system pressure.

Pulse Generating Applications

The Equilibar’s® unique frictionless direct sealing dia-phragm design gives it unprecedented capabilities to generate precision pulse waveforms with millisecond timing.

Your PLC or computer control system can now create realtime pressure waveforms using any fluid and any pump.

The system works by using an Electro-Pneumatic Regulator to command the pulse wave in air. The Equilibar is able to mirror that same pressure wave-form into your process liquid.

®

®

IOR

May, 2010 pg. 7

Applications (continued)

Vacuum Control

The Equilibar® can control in the vacuum range just as easily in the positive pressure range.

The reference pressure can be supplied by a sensitive manual vacuum regulator, or by an electro-pneumatic regulator (as shown).

See the Equilibar Vacuum Regulator brochure for ad-ditional details. Equilibar Precision

Vacuum Regulator®

I O

VacuumSupply

Process

Set Point0-10 VDCor 4-20 mA

E/P

PG

Electro-PneumaticVacuum Regulator

Glove Box / Ventilation Control

The Equilibar can control gas pressures in glove boxes or other ventilation applications.

Supply gas can be provided by a blower or other flow control means, Reference pressure can be provided by an elctro-pneumatic regulator (shown) or manual spring regulator.

I O

R

Gas - Precision Pressure Supply

It is possible to use the Equilibar precision back pres-sure regulator as part of a precision pressure control system, replacing less precise pressure reducing regulators.

A flow control device meters a constant gas flow. The Equilibar is able to vent any excess gas not required by your application. The advantage is far greater precision across widely varying flow rates than by conventional regulators.

Reactor Pressure Control / Nitrogen Padding

The Equilibar® makes it easy to control reactor pres-sure, or to pad vessels with inert gases such as nitro-gen.

Gas inflows to the vessel can be provided by any con-venient means. The Equilibar’s superior flow range (up to 1000:1) and pressure window (down to .02 psi), gives the user a superior operating window. Reference pressure set-point can be provided by the Equilibar® LPR2 for pressures below 0.5 psi, or by an electro-pneumatic regulator for easy computer auto-

I O

R

May, 2010 pg. 8

Water Performance Curves

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NL Liquid Application Sizing Chart

The chart below is presented to help choose the proper size NL Equilibar® for relatively high liquid flows.

Medium Pressure Water Performance

This chart illustrates how the Overpressure varies only slightly with increasing Set-Point pressure.

Precision vs. Size

For liquid flow applications, larger regulator bodies always increase precision and decrease Overpressure. The water performance of a larger regulator EB5NL6 (shown below) exhibits less Overpressure than the EB3NL3 above.

May, 2010 pg. 9

Air Performance Curves

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Low Flow/Low Pressure Air Performance

Low flow gas applications reveal the extra-ordinary unmatched precision capable with the Equilibar.

Medium Pressure Air Perf ormance

The chart below illustrates how the overpressure varies slightly with the increasing Set-Point pressure in the Equilibar.

3/8” Equilibar Air Performance Trials - High

3/8” Equilibar Air Performance Trials - Low Flow

May, 2010 pg. 10

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Manual Control

Equilibar Precision Back Pressure Regulators get their precision from using a fluid set-point pressure (also called ‘reference’ or ‘pilot’ pressure) on their top port.

Customers can supply their own fluid set point signal or chose one of the accessories below.

Set-Point Kits

ApplicationSupply

Pressure Ports

Equilibar Part

NumberOutlet Pressure

RangeRepeatability & Sensitivity

Suggested Pressure Gauge

Ultra Low Pressure

LPR2-7i0.25 to 7 inWC

(0.01 to 0.25 psig)0-10 inWC*

LPR2-14i0.5 to 14 inWC

(0.02 to 0.5 psig)0-30 inWC*

High Precision

max 50 psig T10LR-25p 0.5 to 25 psig 25p-2.5b-2c

T10-25p 2 to 25 psig 25p-2.5b-2c

T10-60p 2 to 60 psig 60p-2.5b-2c

T10-120p 2 to 120 psig 160p-2.5b-2c

Compact Economical

CPR-10 0-10 psig 10p-2.5b-1c

CPR-30 0-30 psig 30p-2.5b-1c

CPR-60 0-60 psig 60p-2.5b-1c

CPR-100 0-100 psig 100p-2.5b-1c

High Pressure

HPR-500p 0-500 psig 500p-2.5b-1c

HPR-1000p 0-1000 psig 1000p-2.5b-1c

HPR-2000p 0-2000 psig 2000p-2.5b-1c

HPR-5000p 0-5000 psig 5000p-2.5b-1c

Vacuum

VPR-30hg 0.4 to 30 inHg

VPR-10hg 0.4 to 10 inHg

Panel mount only

VPR-3hg 0-3 inHg Consult factory

Notes* - No gauge port provided on regulatorAll regulators are self-relieving with continous bleed (consumption)All regulators are designed for air service

VacuumRegulators to 30 inHg

Sensitivity0.1 inHg

20-turn

1/8" Inlet Outlet

(no gauge)30h-2.5b-2

CompactRegulators

1/8"Inlet

OutletGauge

Repeat-ability0.1 psigmax 150 psig

HighPressureRegulators

3000 - 6000 psig

(typical)

1/8"Inlet

OutletGauge

Sensitive through a

wide range of pressures

LPR2Ultra Low PressureRegulator

5 to 20 psig (stable)

Sensitivity: 0.02 inWC

Stability: 0.06 inWC

1/4"Inlet

Outlet(no Gauge)

High PrecisionBelloframType 10

1/4"Inlet

OutletGauge

Sensitivity: .005 psig

max 150 psig

May, 2010 pg. 11

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Process Automation

Automating your process pressure is easily accomplished by using an electronic pressure regulator to provide the set-point pressure to the Equilibar dome-loaded back pressure regulator.

Equilibar is proud to represent precision electronic regulators from Proportion-Air. These devices are custom tuned on the bench to work perfectly with the Equilibar.

Contact Equilibar or visit our website for additional details about the many possible configuration of these products.

Set-Point Controllers

Ultra Precision Regulators (QPV / MPV Series)QPV Series

Aluminum IP65 enclosure Optional digital display

(shown) 4-20 mA or 0-10 VDC

MPV Series Same internals as QVP

0-10 VDC command inputCard, DIN, or manifold mount

Precision Regulators QB1 Series

Aluminum IP65 enclosure Optional digital display

4-20 mA or 0-10 VDC

* Min range: vacuum; 0-1 psig * Max range: , 0 -500 psig * 0.2 to 0.5% FS accuracy * Tuned ready for set-point service * Good for most applications

QP1 High PressureAluminum IP65 enclosure

4-20 mA or 0-10 VDC

* Min range: vacuum; 0-1 psig * Max range: , 0 -1000 psig * 0.5% FS accuracy

* Min range: 0-0.3 psig, vacuum * Max range: 0-150 psig * Superior proportional valve action * Accuracy: 0.1% - 0.5% FS * Resolution: 0.005% - 0.2% FS * Lowest available pressure range in class * Tuned ready for set-point service * Optional DeviceNet / Serial communication

May, 2010 pg. 12

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Contact our EngineersAt Equilibar, your application’s unique requirements will be carefully addressed by one of our trained application engineers. Please contact us if you have any questions or special requirements.

Web: www. equilibar.com

Email: inquiry@equilibar.com

Telephone: (828)650-6590

Fax: (801)504-4439

Address: Equilibar, LLC 320 Rutledge Road Fletcher, NC 28732

Application Engineering . . . How we are different

Unlike mass-market regulator distributors, everything about Equilibar is focused on you, the scientist or engineer with a unique pressure control challenge.

We assign an Application Engineer to you, typi-cally within moments of your call. We work with you closely to identify the optimum model, trim, and diaphragm to best meet your challenge. You can stay in touch with your Application Engineer by email, telephone, mobile phone, or fax.

After installation, if there are any unexpected issues, your Application Engineer is still available to sup-port you with start-up information or (if needed) expedited replacement parts.

About Equilibar

Equilibar, LLC manufacturers and markets our specialized products worldwide. Equilibar branded products are made in the USA, and protected by US and foreign patents.

All of our products are assembled, inspected and tested by trained technicians in Fletcher, NC.

Other products from Equilibar

GS Series Back Pressure Regulators The GS Series has the same exact performance as the NL Series BPRs. This series is made specifically for gas and mixed phase applications due to the 2-piece body design.

Instrument Series BPRs Our new Instrument Series dome loaded back pres-sure regulators offer performance up to 5000 psig and temperatures up to 3270C with the use of SS316 diaphragms and Kalrez® o-rings.

EVR Series Vacuum Regulators The EVR Series uses the GS Series BPR, but adds a manual set-point kit to make vacuum control of processes easy and simple.